Arrangement for wireless telegraphy and telephony



April 15', 1930. A. LEIB 1,754,326

ARRANGEMENT FOR WIRELESS TELEGRAPHY AND TELEPHONY Filed March 26 1925 575 Canaer rserZ 7 I r F 51414044 60: AUGUST LEIB Patented -Apr. 15, 1930RnssUEb UNITED STATES PATENT OFFICE A'UGUS'I. LEIB, BEBLIN, GERMANY,ASSIG'NOB T GESELLSCHAFT FIIR DRAHTLOSE TELEGRAPHIE M. B. 11., 0FBERLIN, GERMANY, A'CORPORATION OF GER-MANY ARRANGEMENT FOR WIRELESSTELEGRAPHY AND TELEPHONY Application filed March 26, 1923, Serial No.627,828, and. in Germany July 4, 1922.

The present invention relates to an arrangement for wireless telegraphyand telephony and is particularly intended for use 1n recelvchronism'with the varying tuning means, 1s employed to render the indicator suchas a detector, an amplifier, a telephone, etc., ineffective for certainpoints or parts of a wave band. Due to this arrangement at certainselectable points of the band of wave lengths to which the receiver maybe tuned by the tuning means, receiving is made impossible, andtherefore these bands or ranges may be barred from, e. g., unauthorizedradio receiving. This may be attained by a switch device which ismechanically connected with the variable condenser or variometer ofatuned circuit of the receiver. telephone receiver cuited so as toprevent reception.

The parts not shown in Fig. 2 are similar to those of Fig. 1 and theconnections likewise y,

. 4 3. 'In a high frequency receiving system,

similar.

I As shown, a disc 1 having a toothed periphery is fixed on the shaft ofthe variable condenser 2 of an oscillating circuit in a receiver. Thisdisc cooperates with a contact device 3 and causes the opening andclosing of this contact when during the rotation of the disc the contactengages depressed and raised portions respectively of its toothedperiphery.

The tuned circuit is completed by the self in- 1 duction 4, and itstuning will continuously pass through the wave band of the receiverwhile the condenser 2 is being rotated, An indicator such, for exampleas an audion 5 with a telephone receiver 6 is connected with theoscillating circuit of the receiver. The contact device 3 is in theconductor leading from the tuned circuit to the audion and willinterrupt this connection while the movable member of contact device 3rests in a notch of the disc 1. For thisreason, receiving is preventedover a corresponding portion of the wave band. Obviously, theinterruption By this device the detector, the I or the amplifiercircuits 20 may be temporarily disconnected or short cirf may beeifected in another part of the circuit arrangement of the receiver e.g. in the anode circuit of the tube, the heating circuit, etc. ers inwhich a device, which operates 1n syn- The arrangement shownin Figure 2is sim ilar to the arrangement shown in Figiurel except that in Figure 2the anode circuit is interrupted by the contact device 1. and 3. v

The invention is particularly-intended. for use inreceiving apparatusin-which the condenser 2 is continuously. operated to repeatedly varythe tuning of the receiver over a band of wave lengths; f-

Having described my=invention,,what I claim'isz- 1. In a high frequencyreceivinggsystem, a resonant circuit,"means=fo.r varying..the tuningofthe circuit, a' second, circuit, and

means-c operated by said tuning varying means'forbreaking said secondcircuit to prevent reception at certain wavelengths.

(2? In a high frequency receiving ,system,

receiving means, a signal responsive device,

,a'r'id-'m"eans for continually and periodically placing said signalresponsive .ydevice into and out ofoperatlve -'relat1on with. saidreceiving means at predetermined separated values of the. incomingsignal wave Elengths.

a resonance circuit, means for continuously and periodically varying thetuning of said circuit through a band of wave lengths, and means forpreventing reception at predetermined separated wavelengths of the band.

4. In a high frequency receiving system, a resonance circuit, means forcontinuously and repeatedly varying the tuning of said circuit through aband of wave lengths, and

means operated by said first means for preventing reception atpredetermined separated Wave-lengths of the band to which said receivingsystem is responsive.

5. In a high frequency receiving system, a resonance circuit, means forcontinuously and repeatedly varying the tuning of the circuit, and meansoperated by said tuning varying means for preventing reception atcertain predetermined separatedwave lengths in the signal band to whichsaid rece1v1ngsystem is responsive.

6. In a high frequency receiving system,

a resonance circuit, means for continuously and repeatedly varying thetuning of the circuit, a second circuit, and means operated by saidtuning varying means for continuously and repeatedly breaking saidsecond circuit to prevent reception at certain wavelengths.

7. In a high frequency receiving system, a circuit having a tuningdevice therein, a signal responsive device, circuit breaking means forcontrolling said signal responsive device, and rotatingmeans foroperating said tuning device and said circuit breaking meanssimultaneously continuously and repeatedly.

8. In a high frequency receiving system, a resonance circuit having atuning device therein, an audion tube having input and output circuits,said input circuit being coupled to said resonance circuit, a circuitinterrupter having contacts in one of said tube circuits, rotating meansfor controlling said tunning device and said circuit interruptersimultaneously, and a telephone in said output circuit.

N 9. In a high frequency receiving system, a resonance circuit includinga condenser, means for controlling said condenser to vary the resonantfrequency of said circuit, a second circuit, and means operated by saidcondenser-controlling means for making and breaking said second circuitto prevent reception at certain Wavelengths.

10. In a receiving arrangement for wireless telegraphy and telephony, aresonant cir= cuit, a continuously rotated condenser for continuouslyand repeatedly varying the tuning of the circuit through a band of wavelengths, a disc mounted on the shaft of the condenser and having atoothed periphery, and contacts controlled by said disc for breaking acircuit of the arrangement so as to prevent reception at certain of thewave lengths in said band.

AUGUST LEIB.

